2 Answers

Brave Bird gives a huge STAB to punish Fighting types who stay in against Skarmory as well as Grass types not named Ferrothorn. Spikes is EH support and Whirlwind Phazes out boosting sweepers and racks up Entry Hazard damage. Roost heals the great Iron Bird and takes away its Flying type for that turn which can help survive and Electric attack or hurt by leaving it susceptible to a Ground or Fighting attack. Leftovers helps keep it alive longer, but Rocky Helmet can help out stall a physical attacker with Roost backing the birdie. As a third alternative, you could use a Shed Shell but that's only if you fear Magnezone trapping your lead with Magnet Pull and OHKOing it with Thunderbolt.

this guy looks a lot less threatening than he really is. Earthquake is a huge STAB and puts a dent in almost anything. Having already solid bulk, going offensive can put the hurt on opponents. Sturdy and Ice Shard almost always net you a 2HKO against Dragon Types and the ability to lay Stealth Rock and use Rapid Spin makes it a valuable option. its a tad unconventional to use Donphan, since Forretress or Starmie as a Spinner, but surprises can be bad for the opposing team if ill-prepared. its a solid Pokemon if you give it the time and tools to do its job.

Pretty much the same but moving Rapid Spin to Donphan frees up a move slot for Cruel which we fill with HP Fire. Now you have some evil to threaten Steel types and Ice types, namely Skarmory, Steelix, Bronzong, Ferrothorn, and the like as well as the ever present threat of Choiced Scizor sets.

For a Ghost type, it seems you're going for a defensive set. but I have am idea you may enjoy:

so Magic Guard negates Life Orb recoil which is basically a free 30% increase to all attacks. STAB Psychic is a tad more powerful, but STAB Psyshock has the perk of punching Blissey right in her stupid Specially Defensive face. T-Bolt is just a great move to have in general, but with a few Calm Minds and Life Orb backing it, it can destroy entire teams. obviously Calm Mind boosts your already formidable SAtk stat while also turning Reuniclus into a tank. Recover helps set up and keep Reuniclus alive long enough to get that can o' whoop ace open.pretty evil. that's about it.

For a lead you could put infernape with overheat, endeavor, Mach punch and stealth rock. Focus sash. With +sp.atk & - sp.def nature. From experience the overheat can knock out hipowden and gliscors that are not special defensive in two hits even from the sp.atk drop